/*
 * Copyright (c) 2018 Baidu, Inc. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.baidu.formula.launcher.filter.inner;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.net.URLClassLoader;
import java.util.Arrays;

/**
 * @author Bowu Dong (tq02ksu@gmail.com)
 */
public class AbstractStartFilterSupport {
    private static final Logger logger = LoggerFactory.getLogger(AbstractStartFilterSupport.class);

    ClassLoader deduceParentClassLoader() {
        ClassLoader cl = ClassLoader.getSystemClassLoader();

        ClassLoader context = Thread.currentThread().getContextClassLoader();

        if (cl != context) {
            cl = context.getParent();
        }

        logger.info("deduced Parent Class Loader: {}, urls: {}", cl,
                cl instanceof URLClassLoader ? Arrays.asList(((URLClassLoader) cl).getURLs()) : "-");
        return cl;
    }
}
